New South Wales Police have revealed they are investigating reports of a paedophile ring operating in the area where three-year-old William Tyrrell disappeared, after the toddler's parents made an emotional plea for their son's return.

"As I was walking in the bush with other people, it became more aware to me as time went on, that this is not a normal event, this is not a child gone missing in the bush, this is heading down the path of abduction or something more sinister."

"He always had us in earshot or eyesight ... he's not a wanderer, not a child to run away," his mother added.

"I have a vision in my head... I can't explain it.

"Somebody reached over and I sort of feel like they've gone 'clump' on his shoulders and they've picked him up and moved him on, because to me that's the only way I can explain for him not to be there."

But if William was abducted, his mother does not believe it was someone from the Kendall community.

"I don't think it is somebody from the community, I think it is someone who doesn't have a history there. I cant see a true local, who knows my mum, who knows us, and knows our family, choosing to take our child," she said.

Hundreds of people were involved in searches to find William, and police asked anyone within a kilometre of the area on the day he disappeared to contact them.

In March, homicide police raided properties in Laurieton, near Kendall, and said they were speaking to a number of people as part of their inquiries.

William's parents had a message for anyone that may be holding William.

"Just give him back. Take him to a church, take him to a police station, take him to a school, give him to someone — give him back," his mother said.

You have no doubt been hearing a lot about the Paris Agreement and know that it pertains to climate change, but are too embarrassed at this stage to ask for an overall explanation of what it's all about.